Fixed the thumbnail for you.
I really like this UI. Nice and clean
Two suggestions though:

1. Reduce the size of the spacing between your buffs in the top right, and the actionbar on the right. I would personally make them the same distance apart as the actionbars at the bottom centre.

2. The class coloured gradient bars at the bottom of the screen could be improved.
I feel it is easier to demonstrate how I would improve it than to type out how I would do it
Here is an example I quickly made on Microsoft Paint:
Looks a bit more structured

1. Is it necessary for you to see your stance bar? Think you could possibly hide it until mouse over?
2. You've got a lot of various fonts going on in the UI. Might wanna try and find a good font that you're currently using and stick with that one to keep it looking uniform.
3. Things just kinda seem all over the place to me personally, but if that works for you, then awesome!

Overall, I think the coloration is good, but black on black is kinda rough when one is trying to figure out if they are losing/gaining health. All in all, it's definitely a good start.

Fixed the thumbnail for you.
I really like this UI. Nice and clean
Two suggestions though:

1. Reduce the size of the spacing between your buffs in the top right, and the actionbar on the right. I would personally make them the same distance apart as the actionbars at the bottom centre.

2. The class coloured gradient bars at the bottom of the screen could be improved.
I feel it is easier to demonstrate how I would improve it than to type out how I would do it
Here is an example I quickly made on Microsoft Paint:
Looks a bit more structured

Fixed the thumbnail for you, too.

I like what you did to bars at bottom Will look into fixing buffs and right bar. I thought they were the same but now since you point it out I can see the gaps :P

Back in my day, we killed bosses 400 times a day...uphill both ways...in the snow...and we fucking liked it. In related news, I hear that uninstalling WoW completely from your hard drive and then reinstalling it resets your RNG numbers. -septor